Lot 0211-G4Bidirectional motorway tunnel, part of the luganese beltway system:- Excavation of a tunnel of a length of 2'350 m and a section of 73 - 86 m2- Ventilation shaft of a height of 98 m and a diameter of 4.00 m including an access gallery and a ventilation cavern- Reinforcement of the section where the tunnel will cross the Ceneri railroad tunnel (NRLA)- 4 enlargements for security stop (every 600 m) of a length of 41 m and a section of 156 m2 each

Activities

Conventional rock excavation using a 3 arms jumbo; depending of the rock quality and other environmental reasons, excavation of the full or partial section.

The rock cover to the existing railroad Milano-Zürich being only 7 meters, the first phase was executed under the protection of a grouted pipe poling umbrella.

Rock support by means of shotcrete with fibers, rock bolts and/or steel sets.

Internal lining: membrane insulation and cast in place concrete.

Inserted ceiling for the final ventilation system and cast in place concrete for portal work